Javascript Parsing Array And Getting The Unique Value

I have the following array: array-1: Array[11] 0:'265' 1:'text-success' 2:'51' 3:'text-warning' 4:'16' 5:'text-warning'

Solution 1:

It's not clear whether you have an object that contains multiple arrays, or just a standard one-dimensional array for which you've given several possible examples, but assuming the latter I think this is what you're looking for:

functionsingles(array) {
  var foundIndex = -1;
      
  for(var index = 0; index < array.length; index++) {
    if(array[index] === "text-success" || array[index] === "muted") {
      if (foundIndex != -1) {
        // we've found two, so...returnnull;
      }
      foundIndex = index;
    }
  }
  if (foundIndex != -1) {
    return [ array[0], array[foundIndex], array[foundIndex+1] ];
  }
  return"Some default value for when it wasn't found at all";
}

console.log(singles(["532","text-warning","51","text-warning","16","muted","35","text-warning","38","text-warning","106"]));
console.log(singles(["533","text-warning","51","text-warning","16","muted","35","text-success","38","text-warning","106"]));

This loops through the input array. The first time "text-success" or "muted" is found its index is stored in foundIndex.

If "text-success" or "muted" is found a second time we immediately return null.

If we get to the end of the loop then we know we found "text-success" or "muted" either once or not at all. If it was found once we return an array of three elements included the first item in the input array, the value of "text-success" or "muted", and then the item that immediately followed that text in the array.

(Note: in your example output from Array 1 you returned the value after the matched text, but in your example output from Array 4 you returned the value before the matched text. I don't know which one you really want, but you can easily modify my function to do one or the other.)

You didn't say what you wanted to return if "text-success" or "muted" wasn't present in the array, so I've just returned a place-holder string.

Solution 2:

If you want to test if it exists "text-success" or "muted" once in the array, use this function, it will return a boolean:

functionsingles(array) {
    var single = false;
    for (var i = 0; i < array.length; i++) {
        if (array[i] === "text-success" || array[i] === "muted") {
            if (single) {
                returnfalse;
            }
            single = true;
        }
    }
    return single;
}

If you want to return the unique value among "text-success" or "muted", use the following function. It will return the unique value, or null otherwise:

functionsingles(array) {
    var single = null;
    for (var i = 0; i < array.length; i++) {
        if (array[i] === "text-success" || array[i] === "muted") {
            if (single) {
                returnnull;
            }
            single = array[i];
        }
    }
    return single;
}

If you need the code of the corresponding value, use this:

functionsingles(array) {
    var single = null;
    for (var i = 1; i < array.length; i += 2) {
        if (array[i] === "text-success" || array[i] === "muted") {
            if (single) {
                returnnull;
            }
            single = array[i - 1];
        }
    }
    return single;
}